This document provides an introduction and overview of the Lean Startup methodology. It discusses key concepts such as validated learning, building minimum viable products to test learning, and the build-measure-learn feedback loop. The goal of Lean Startup is to minimize the time and effort to collect validated learning from customers through frequent experimentation. This is done by developing an MVP, measuring customer behavior, tuning the product based on data, and deciding whether to pivot the concept or persevere.